(b)
Use the AVM flight history to determine the source of the vibration. 1) If the source of the AVM indication is fan vibration:
a) Do a fan trim balance (AMM 71-00-01/201). 2) If the source of the AVM indication is core vibration: a) Do the High Vibration Trouble Shooting procedure (AMM 71-00-47/101).
b) If you do not find the source of the core vibration, do a vibration survey (AMM 71-00-00/501) and contact CFMI for vibration level confirmation to replace the engine.
I. Oil Consumption Limits
S 842-053-C00
(1) Normal oil consumption is less than
0.4 U.S. quarts/hour or
0.1 U.S. gallons/hour (0.38 liters/hour).
S 842-054-C00
(2) If you find increased oil consumption that meets the conditions that follow, you must find the cause and take corrective action; do the engine oil trouble shooting procedure (AMM 71-00-44/101):
(a)
Oil consumption that shows a gradually increasing trend.
(b)
Oil consumption that shows a sudden step increase.
(c)
Oil consumption that is more than
0.8 U.S. quarts/hour or
0.2 U.S. gallons/hour (0.76 liters/hour).
S 842-055-C00
(3) Oil consumption must not be more than a maximum of
1.6 U.S. quarts/hour or
0.4 U.S. gallons/hour (1.5 liters/hour).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-00
ALL ú ú C03 Page 235 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
J. Compressor Stall
S 842-056-C00
(1)
Compressor stalls are caused by an aerodynamic disruption of the usually smooth airflow through the compressor stages.
S 842-057-C00
(2)
The disruption of the air flow can be caused by these conditions:
(a)
There is foreign object ingestion or damage (FOD).
(b)
The airfoils are distorted.
(c)
The variable stator vanes (VSV) are off schedule.
S 842-058-C00
(3)
A compressor stall may be indicated by these conditions:
(a)
Abnormal engine noises.
(b)
Flames from the engine exhaust and possibly from the engine inlet in severe cases.
(c)
Fluctuating engine performance parameters.
(d)
Slow throttle response or no throttle response.
(e)
High EGT, or a quick EGT increase when throttle is advanced.
S 842-059-C00
CAUTION: THE DECISION TO CONTINUE OPERATION OF AN ENGINE THAT HAS
_______ ENCOUNTERED A SEVERE COMPRESSOR STALL (OR STALLS) MUST BE MADE UNDER THE CONSIDERATION THAT POSSIBLE ADDITIONAL STALL OCCURRENCES AND INCREASED ENGINE DAMAGE MAY OCCUR. CONTINUED OPERATION MUST BE WITH CAUTION.
NEVER ADVANCE, OR FAIL TO RETARD, THE THRUST LEVER ON AN ENGINE THAT IS STALLING. ENGINE DESTRUCTION CAN OCCUR.
(4)
If there is a compressor stall (surge), do these steps:
(a)
Quickly (in 1 to 2 seconds) move the forward thrust lever rearward to idle power to clear the stall. 1) Make sure the EGT and the N2% rpm decreases to normal idle
indications.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
71-00-00
ALL ú ú C03 Page 236 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
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